Mesoporous superacids S2O82–-Fe2O3/SBA-15(SFS)with active nanoparticles are prepared by ultrasonic adsorption method.This method is adopted to ensure a homo-dispersed nanoparticle active phase,large specific surface ...Mesoporous superacids S2O82–-Fe2O3/SBA-15(SFS)with active nanoparticles are prepared by ultrasonic adsorption method.This method is adopted to ensure a homo-dispersed nanoparticle active phase,large specific surface area and many acidic sites.Compared with bulk S2O82–-Fe2O3,Br?nsted acid catalysts and other reported catalysts,SFS with an Fe2O3 loading of 30%(SFS-30)exhibits an outstanding activity in the probe reaction of alcoholysis of styrene oxide by methanol with 100%yield.Moreover,SFS-30 also shows a more excellent catalytic performance than bulk S2O82–-Fe2O3 towards the alcoholysis of other ROHs(R=C2H5-C4H9).Lewis and Bronsted acid sites on the SFS-30 surfaces are confirmed by pyridine adsorbed infrared spectra.The highly efficient catalytic activity of SFS-30 may be attributed to the synergistic effect from the nano-effect of S2O82–-Fe2O3 nanoparticles and the mesostructure of SBA-15.Finally,SFS-30 shows a good catalytic reusability,providing an 84.1%yield after seven catalytic cycles.展开更多
The system of the catalyst S2O82-/ZrO2-SiO2-Sm2O3 were studied by IR,and the effect on the catalyst characters by different Si/Zr atom ratio,immersing solution and rare earth were studied.The result showed that the ca...The system of the catalyst S2O82-/ZrO2-SiO2-Sm2O3 were studied by IR,and the effect on the catalyst characters by different Si/Zr atom ratio,immersing solution and rare earth were studied.The result showed that the catalyst has the best activity when the Si/Zr atom ratio is 15%,3.0% Sm2O3 and immersing solution was S2O82- instead of SO42-.The deduction of S2O82- maybe formed a bridge structure with Zr not with Si were explained well here.展开更多
文摘Mesoporous superacids S2O82–-Fe2O3/SBA-15(SFS)with active nanoparticles are prepared by ultrasonic adsorption method.This method is adopted to ensure a homo-dispersed nanoparticle active phase,large specific surface area and many acidic sites.Compared with bulk S2O82–-Fe2O3,Br?nsted acid catalysts and other reported catalysts,SFS with an Fe2O3 loading of 30%(SFS-30)exhibits an outstanding activity in the probe reaction of alcoholysis of styrene oxide by methanol with 100%yield.Moreover,SFS-30 also shows a more excellent catalytic performance than bulk S2O82–-Fe2O3 towards the alcoholysis of other ROHs(R=C2H5-C4H9).Lewis and Bronsted acid sites on the SFS-30 surfaces are confirmed by pyridine adsorbed infrared spectra.The highly efficient catalytic activity of SFS-30 may be attributed to the synergistic effect from the nano-effect of S2O82–-Fe2O3 nanoparticles and the mesostructure of SBA-15.Finally,SFS-30 shows a good catalytic reusability,providing an 84.1%yield after seven catalytic cycles.
文摘The system of the catalyst S2O82-/ZrO2-SiO2-Sm2O3 were studied by IR,and the effect on the catalyst characters by different Si/Zr atom ratio,immersing solution and rare earth were studied.The result showed that the catalyst has the best activity when the Si/Zr atom ratio is 15%,3.0% Sm2O3 and immersing solution was S2O82- instead of SO42-.The deduction of S2O82- maybe formed a bridge structure with Zr not with Si were explained well here.